/*
 * Copyright (c) Cliff Rowley, James Deakin
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of the <ORGANIZATION> nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import acid.util.IObserver;

/**
 * Observable superclass.
 * @author crowley <cliffrowley@gmail.com> */
class dna.util.Observable
{
	
	/** Registered observers */
	private var __observers:Array;
	
	/**
	 * Registers an observer.
	 * @param observer The IObserver to register.	 */
	public function addObserver(observer:IObserver):Void
	{
		__observers.push(observer);
	}
	
	/**
	 * Unregisters an observer.
	 * @param observer The IObserver to unregister.	 */
	public function removeObserver(observer:IObserver):Void
	{
		for (var i:Number = 0; i < __observers.length; i++) {
			if (observer == __observers[i]) {
				__observers.splice(i, 1);
				break;
			}
		}
	}
	
	/** Unregisters all observers. */
	public function removeAllObservers():Void
	{
		__observers = [];
	}
	
	/**
	 * Notify all observers of an update event.
	 * @param type The update type.
	 * @param args The update arguments.	 */
	public function notifyObservers(type:String, args:Object):Void
	{
		for (var i:Number = 0; i < __observers.length; i++) {
			__observers[i].update(type, args);
		}
	}
	
}